Rates of women who are opting for preventive mastectomies, such as Angeline Jolie, have increased by an estimated 50 percent in recent years, experts say. But many doctors are puzzled because the operation doesn't carry a 100 percent guarantee, it's major surgery -- and women have other options, from a once-a-day pill to careful monitoring.

WHO said in a statement on Tuesday that two of the cases are confirmed as Ebola and that the rest are "probable" Ebola.

The outbreak in Congo's Orientale Province follows one last month in neighboring Uganda that killed 16 people. Ugandan health officials say the outbreak there is under control, but they have yet to declare the country free of Ebola. It is not clear if the outbreak in Congo is related to the one in Uganda.

WHO said Congolese health officials are working with groups such as Doctors Without Borders to stem the spread of Ebola.

Ebola is highly infectious and kills quickly.

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